SCIENTIFIC AMERICAN SUPPLEMENT NO. 822

NEW YORK, October 3, 1891

Scientific American Supplement. Vol. XXXII, No. 822.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.


TABLE OF CONTENTS.
I.[ANTHROPOLOGY.—The Study of Mankind.—A review of Prof.Max Muller's recent address before the British Association.]
II.[CHEMISTRY.—Standards and Methods for the Polarimetric Estimationof Sugars.—A U.S. internal revenue report on the titularsubject.—2 illustrations.]
[The Formation of Starch in Leaves.—An interesting examinationinto the physiological role of leaves.—1 illustration.]
[The Water Molecule.—By A. GANSWINDT.—A very interestingcontribution to structural chemistry.]
III.[CIVIL ENGINEERING.—Demolition of Rocks under Waterwithout Explosives.—Lobnitz System.—By EDWARD S. CRAWLEY.—Amethod of removing rocks by combined dredging andramming as applied on the Suez Canal.—3 illustrations.]
IV.[ELECTRICITY.—Electrical Standards.—The English Board ofTrade commission's standards of electrical measurements.]
[The London-Paris Telephone.—By W.H. PREECE, F.R.S.—Detailsof the telephone between London and Paris and its remarkablesuccess.—6 illustrations.]
[The Manufacture of Phosphorus by Electricity.—A new industrybased on dynamic electricity.—Full details.]
[The Two or Three Phase Alternating Current Systems.—ByCARL HERING.—A new industrial development in electricityfully described and graphically developed.—15 illustrations.]
V.[GEOGRAPHY AND EXPLORATION.—The Grand Falls ofLabrador.—The Bowdoin College exploring expedition and its adventuresand discoveries in Labrador.]
VI.[MECHANICAL ENGINEERING.—Improved Changeable SpeedGearing.—An ingenious method of obtaining different speeds atwill from a single driving shaft.—2 illustrations.]
[Progress in Engineering.—Notes on the progress of the lastdecade.]
VII.[MEDICINE AND HYGIENE.—Eyesight.—Its Care during Infancyand Youth.—By L. WEBSTER FOX, M.D.—A very timelyarticle on the preservation of sight and its deterioration amongcivilized people.]
[The Use of Compressed Air in Conjunction with Medicinal Solutionsin the Treatment of Nervous and Mental Affections.—ByJ. LEONARD CORNING.—The enhancement of the effects of remediesby subsequent application of compressed air.]
VIII.[MINERALOGY.—A Gem-Bearing Granite Vein in WesternConnecticut.—By L.P. GRATACAP.—A most interesting mineralfissure yielding mica and gems recently opened.]
IX.[NATURAL HISTORY.—Ants.—By RUTH WARD KAHN.—Aninteresting presentation of the economy of ants.]
X.[NAVAL ENGINEERING.—Armor Plating on Battleships—Franceand Great Britain.—A comparison of the protective systemsof the French and English navies.—5 illustrations.]
[The Redoutable.—An important member of the French Mediterraneanfleet described and illustrated.—1 illustration.]
XI.[TECHNOLOGY.—New Bleaching Apparatus.—A newly inventedapparatus for bleaching pulp.—2 illustrations.]